Formal models and scripts: expressions-compiler

Tools: Python

These are the working models and scripts this part of the hunt used. Some encode the code as it is (a counterexample is the expected result), others a fixed or correct variant; read the header comment of each file. Paths inside them were replaced by placeholders such as $LUCENE (a Lucene checkout) and $WORK.

Findings

• Expressions: !, &&, || and ?: keep only the low 32 bits of a bitwise/shift result or hex/octal literal, so a non-zero value such as 1 << 32 or 0x100000000 counts as false (finding LFV-181; repro · finding page)

Files

• model/smt/truth_conversions.py (used for LFV-181)

How to run

• Python: python3 <file>.py; scripts that import z3 need the z3-solver package.

Snapshot of 2026-11-04. AI-assisted; not yet triaged by a human Lucene committer. Feedback: open an issue in lucene-ai-bug-hunt.